skolaonline.cz

Readiness by lane

Green: skolaonline.cz. Thin bar: Education & Online Learning peer median.

Priority fixes for skolaonline.cz

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   Why it matters: HSTS tells browsers to use HTTPS for your host on every later visit, which removes the window where a first HTTP request can be intercepted.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   34% of Education & Online Learning peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Enable

   Meta description written

   Observed: The homepage had no meta description.

   What to do: Write a short, specific description of the page for people, not a list of keywords.

   84% of Education & Online Learning peers do this.

   Guide: Meta Titles and Descriptions That Match Search Intent

3. Priority 3 · Enable

   Canonical URL declared

   Observed: The homepage did not declare a canonical URL.

   What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.

   62% of Education & Online Learning peers do this.

   Guide: Canonical Tags: A Decision Guide for Duplicate URLs

4. Priority 4 · Harden

   Framing restricted

   Observed: The homepage did not send frame-ancestors or X-Frame-Options, so other sites may frame it.

   What to do: Send Content-Security-Policy: frame-ancestors 'self' (or a list of trusted origins). X-Frame-Options: SAMEORIGIN covers older browsers.

   49% of Education & Online Learning peers do this.

   Guide: A Practical Website Health Check for Owners

What skolaonline.cz already does well

Practices fewer than half of Education & Online Learning peers use.

• DNSSEC signedDNSSEC delegation (DS record) present.8.1% of peers
• Nameservers spread across providersNameservers spread across more than one operator.13% of peers
• Content Security Policy presentContent-Security-Policy present.25% of peers

What we saw

Homepage checked

https://www.skolaonline.cz/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Alpiro s.r.o., 198-day validity, expiring 2026-11-25

DNS operators

3 self-run or other nameserver domains

DMARC policy

p=quarantine

Homepage HTML

7 KB, gzip

Images on homepage

2 (webp 2)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

All 31 checks

Select a gap for the method and fix. How each check works

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Education & Online Learning readiness benchmark